logo

CuriousTab

CuriousTab

Discussion


Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • pH meter has


  • Options
  • A. one cell
  • B. two cells
  • C. three cells
  • D. no cell

  • Correct Answer
  • two cells 


  • Process Control and Instrumentation problems


    Search Results


    • 1. A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in

    • Options
    • A. light intensity
    • B. current
    • C. flux density
    • D. voltage
    • Discuss
    • 2. A system with a double pole at the origin is unstable since the corresponding term in the time domain

    • Options
    • A. is a constant.
    • B. grows exponentially with time.
    • C. grows linearly with time.
    • D. decays linearly with time.
    • Discuss
    • 3. A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is

    • Options
    • A. 45°
    • B. -90°
    • C. -180°
    • D. -45°
    • Discuss
    • 4. Emf generated in a thermocouple depends on the temperature

    • Options
    • A. of cold junction only.
    • B. of hot junction only.
    • C. difference between hot and cold junctions.
    • D. difference between cold junction and atmospheric temperature.
    • Discuss
    • 5. The transfer function of a second order system is

    • Options
    • A.
    • B.
    • C.
    • D. none of these
    • Discuss
    • 6. Radiation thermometer can not measure the temperature

    • Options
    • A. inside a pressure vessel.
    • B. of an object without coming in contact with it.
    • C. of liquid oxygen.
    • D. of moving objects at high temperature.
    • Discuss
    • 7. Thermal wells are used in the temperature measurement to

    • Options
    • A. guard against corrosive and oxidising action on thermocouple materials
    • B. reduce measuring lag.
    • C. increase the fidelity.
    • D. increase the sensitivity.
    • Discuss
    • 8. Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?

    • Options
    • A. Platinum-platinum + rhodium
    • B. Iron-constantan
    • C. Copper-constantan
    • D. Chromel-alumel
    • Discuss
    • 9. To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

    • Options
    • A. air
    • B. a metal powder or graphite
    • C. oil
    • D. mercury
    • Discuss
    • 10. Routh test

    • Options
    • A. criterion provides information about the actual location of roots.
    • B. cannot be used to test the stability of a control system containing transportation lag.
    • C. criterion is not applicable to systems with polynomial characteristic equation.
    • D. can not determine as to how many roots of the characteristics equation have positive real roots.
    • Discuss


    Comments

    There are no comments.

Enter a new Comment